fertilization

definition: 
The action or process of fertilizing an egg or a female animal or plant;The action or process of applying a fertilizer to soil or land.
sentence: 
The embryos of all sexually reproducing organisms develop from a single cell, formed by the fusion of a male and a female gamete at fertilization. The effect of rootstock on wine quality is probably no greater than that of other factors such as soil, climate, fertilization, and irrigation.
difficulty: 
easy
toefl frequency: 
2